• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The aim of this investigation is to determine the concentration of Limewater.

Extracts from this document...


Orehra Mahmood- Limewater practical. Aim: The aim of this investigation is to determine the concentration of Limewater. Plan: I am required to find the concentration of a sample of Limewater solution in g dm3 Ii is vital for me to design my own experiment and choose a range of appropriate equipment and apparatus. I am provided with 250 cm3 of Limewater, which has been made such that it contains approximately 1g dm3 of calcium hydroxide. Also available is hydrochloric acid, which has a concentration of 2.00 mole dm3, however this concentration is too much though, so it is necessary to dilute it to an appropriate diluted volume. The indicator will be supplied to me-, which is known as methyl orange. Slaked lime dissolved in water is called Limewater. Calcium oxide reacts violently with water to produce calcium hydroxide (slaked lime) Addition of further water to Calcium hydroxide produces the saturated aqueous solution known as Limewater. In order for me to establish the concentration of the Limewater it is necessary to react the Hydrochloric acid with the Limewater. ...read more.


So if I were to use the phenolphthalein indicator then the end point (colour change) would be reached before the equivalence point (when the chemicals, acid-base break up). Calculations:- In order to work out the amount of molar of acid I will require to carry out some calculations. I need to work out how much I will need to dilute the acid until it is at the appropriate dilution for my investigation. Here are the calculations that I carried out to work out the dilution I required for my acid:- Moles = mass/molar weight (Mr)= 1gdm-3. Ca (oh) 2 40+ (16 +1) x2 =40+ 34 =74g =1gdm- 3/ 74g/ mol =0.0135 mol/ dm-3 = 25 x 0.0135/ 1000 = 0.00034 mols. Ca (OH)2 + HCL - CaCl2 + 2H20. Balance the equation above to get--- 1 mol of Ca (OH) 2 = 2 mols of HCL. 0.00034 x 2 = 0.0007 mols. Mols = volume / 1000 x morality, Morality = mols x 1000 / volume. ...read more.


I want to dilute the acid to 0.1 moles, so I pipette 25.0cm3 of HCl from the original bottle and place it in the 500cm3 volumetric flask. Then I add 475cm3 of distilled water to the same volumetric flask, I measure the amount of water by looking at the graduated mark on the flask and fill until the 500cm3 mark. Once I have obtained the correct concentration of Hydrochloric acid I can precede to the rest of the experiment. First I must set up the apparatus as I have indicated in my diagram. I will be using 25.0cm3 of Limewater and I will transfer it into the conical flask using a 25.0cm3 pipette. It is also important to add the indicator into the conical flask so that the neutralisation point can be obtained, where five drops of methyl orange should be appropriate. When the indicator is added the colour of the solution is light, clear, orange and this should turn to pink by the end of the titration. In order to obtain consistent and reliable results it is necessary to repeat the experiment several times. After this it the results must be noted in a table ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Aqueous Chemistry essays

  1. Marked by a teacher

    Enthalpy of Neutralisation.

    3 star(s)

    Percentage error = actual yield - theoretical yield x 100 Actual yield 1 = -57.1 - (-65.86) x 100 -57.1 1 = 15.33% EXPERIMENT 2: Sulphuric acid (H2SO4) and Sodium Hydroxide (NaoH). This experiment is the same as the first experiment but I will be using Sulphuric acid (200cm3 of 1 molar)

  2. Antacid Investigation.

    the acid Rennie 13.8 divided by 1000 = 0.0138cm3 Moles of HCl = concentration x volume = 1 x 0.0138cm3 = 0.0138 moles needed to neutralise the acid Rennie rap-eze. 9.8 divided by 1000 = 0.0098cm3 Moles of HCl = concentration x volume = 1 x 0.0098cm3 = 0.0098 moles needed to neutralise the acid Boots.

  1. Aspirin Investigation

    C6H5COO+ 43 COCH3 The most significant difference in the mass spectra is the presence of a major peak at 43 in the Aspirin mass spectrum. This is due to the presence of a COCH3+ ion that cannot be formed from the fragmentation of the salicylic acid molecule.

  2. Reactivity Series Investigation

    resists attack by most acids but dissolves in aqua regia.It is used in the storage of nitric,concentrated sulphuric,and organic acids and many other chemical reagents.Calcium metal dissolves readily in dilute or concentrated hydrochloric acid to form solutions containing the aquated Ca(II) ion together with hydrogen gas, H2. Ca(s) + 2HCl(aq)

  1. The aim of my experiment is to find the exact concentration of limewater. In ...

    Begin by preparing the burette. The inside of the burette will be rinsed thoroughly with distilled water, including the portion below the tap. When rinsed the washings should be tipped away and the process should be repeated again to make sure that the burette is free from impurities that the burette may have accumulated inside it when it is not in use.

  2. The aim of this experiment is to determine as accurately as possible the concentration ...

    easily be able to tell when the required amount of Hydrochloric acid is added). At the end point the tap on the burette must immediately be closed so there is no excess of Hydrochloric acid added. I will record the amount titrated accurately to 0.05cm3.

  1. Determine the concentration of lime water.

    So any error through equipment is minimal, yet it still has to be taken into consideration. I feel that there was little limitation in the procedure and any limitation was minimal. An example of this is the minute splashes that occur in the conical flask during the titration, which some of it gets on the walls of the conical flask.

  2. To determine the concentration of Limewater solution

    Knowledge from "http://www.sci-ctr.edu.sg/ScienceNet/cat_physical/cat_che01617.html" (web site). (Variables) In this experiment there are many variables which could be changed. However it is very important that I keep the correct variables constant through the practical or it will not be a fair test.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work